133881643 has 16 divisors (see below), whose sum is σ = 160344576. Its totient is φ = 109296000.

The previous prime is 133881637. The next prime is 133881659. The reversal of 133881643 is 346188331.

It is not a de Polignac number, because 133881643 - 2⁹ = 133881131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133881673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38755 + ... + 42067.

It is an arithmetic number, because the mean of its divisors is an integer number (10021536).

Almost surely, 2^133881643 is an apocalyptic number.

133881643 is a deficient number, since it is larger than the sum of its proper divisors (26462933).

133881643 is a wasteful number, since it uses less digits than its factorization.

133881643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594.

The product of its digits is 41472, while the sum is 37.

The square root of 133881643 is about 11570.7235296675. The cubic root of 133881643 is about 511.5722886238.

The spelling of 133881643 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, six hundred forty-three".